📝 docs: update CI/CD documentation for container/services approach

README.md

@@ -43,11 +43,69 @@ go run ./cmd/greet
 
 ## CI/CD Pipeline
 
-dance-lessons-coach includes a portable CI/CD pipeline using GitHub Actions syntax:
+dance-lessons-coach features an optimized CI/CD pipeline using GitHub Actions with container/services architecture:
 
-### Features
+### Key Features
-- ✅ **Multi-platform**: Works on Gitea, GitHub, and GitLab
+- ✅ **Container-based execution**: All steps run in pre-built Docker cache images
-- ✅ **Build & Test**: Automated Go builds and tests
+- ✅ **Service-based PostgreSQL**: Automatic database service provisioning
+- ✅ **Smart caching**: Dependency-aware cache invalidation
+- ✅ **Multi-platform**: Compatible with Gitea, GitHub, and GitLab
+- ✅ **Fast execution**: No Docker Compose overhead
+- ✅ **Reliable testing**: Full database connectivity with proper environment setup
+
+### Architecture
+
+The pipeline uses GitHub Actions' native `container` and `services` directives instead of Docker Compose:
+
+```yaml
+jobs:
+  ci-pipeline:
+    container:
+      image: gitea.arcodange.lab/arcodange/dance-lessons-coach-build-cache:${{ needs.build-cache.outputs.deps_hash }}
+    
+    services:
+      postgres:
+        image: postgres:15
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: dance_lessons_coach_bdd_test
+```
+
+### Benefits
+
+1. **Performance**: Direct container execution without compose overhead
+2. **Reliability**: Service containers managed by GitHub Actions
+3. **Simplicity**: Cleaner workflow definition
+4. **Portability**: Works across CI platforms
+5. **Caching**: Intelligent dependency-based cache rebuilding
+
+### Workflow Steps
+
+1. **Build Cache**: Creates Docker image with Go tools and dependencies
+2. **CI Pipeline**: Runs tests, builds binaries, and generates documentation
+3. **Database Tests**: Connects to PostgreSQL service container
+4. **Coverage Reporting**: Updates coverage badges automatically
+5. **Artifact Publishing**: Builds and pushes Docker images (main branch only)
+
+### Environment Configuration
+
+The pipeline automatically sets up database environment variables:
+
+```bash
+echo "DLC_DATABASE_HOST=postgres" >> $GITHUB_ENV
+echo "DLC_DATABASE_PORT=5432" >> $GITHUB_ENV
+echo "DLC_DATABASE_USER=postgres" >> $GITHUB_ENV
+echo "DLC_DATABASE_PASSWORD=postgres" >> $GITHUB_ENV
+echo "DLC_DATABASE_NAME=dance_lessons_coach_bdd_test" >> $GITHUB_ENV
+echo "DLC_DATABASE_SSL_MODE=disable" >> $GITHUB_ENV
+```
+
+### Status
+
+[![Build Status](https://gitea.arcodange.fr/api/badges/arcodange/dance-lessons-coach/status)](https://gitea.arcodange.fr/arcodange/dance-lessons-coach)
+[![Coverage](https://img.shields.io/badge/coverage-0%-red?style=flat-square)](https://gitea.arcodange.lab/arcodange/dance-lessons-coach)
+=======
 - ✅ **Linting**: Code quality checks with `go fmt` and `go vet`
 - ✅ **Version Management**: Automatic version detection
 - ✅ **Portable**: Uses standard GitHub Actions workflow format

adr/0016-ci-cd-pipeline-design.md

@@ -1,10 +1,10 @@
 # 16. CI/CD Pipeline Design for Multi-Platform Compatibility
 
 **Date:** 2026-04-05
-**Status:** 🟡 Proposed
+**Status:** ✅ Accepted
 **Authors:** Arcodange Team
-**Decision Date:** TBD
+**Decision Date:** 2026-04-08
-**Implementation Status:** Not Started
+**Implementation Status:** ✅ Completed
 
 ## Context
 
@@ -758,7 +758,81 @@ graph TD
 
 ---
 
-**Status:** Proposed   
+## Implementation Status
-**Next Review:** 2026-04-12   
+
+### ✅ Completed - Container/Services Architecture
+
+The CI/CD pipeline has been successfully implemented using GitHub Actions' container/services architecture:
+
+**Key Implementation Details:**
+
+1. **Container-based Execution**: All CI steps run within a pre-built Docker cache image containing Go tools, Node.js, and PostgreSQL client
+2. **Service-based PostgreSQL**: Database provided as a service container, accessible via `postgres` hostname
+3. **Smart Caching**: Dependency hash calculated from `go.mod`, `go.sum`, and `Dockerfile.build` for accurate cache invalidation
+4. **Environment Configuration**: Database connection parameters set via `DLC_*` environment variables
+5. **Simplified Workflow**: Removed Docker Compose overhead and unnecessary setup steps
+
+**Current Workflow Structure:**
+
+```yaml
+jobs:
+  build-cache:
+    name: Build Docker Cache
+    # Calculates dependency hash and builds cache image if needed
+    
+  ci-pipeline:
+    name: CI Pipeline
+    needs: build-cache
+    container:
+      image: gitea.arcodange.lab/arcodange/dance-lessons-coach-build-cache:${{ needs.build-cache.outputs.deps_hash }}
+    
+    services:
+      postgres:
+        image: postgres:15
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: dance_lessons_coach_bdd_test
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      
+      - name: Set database environment variables
+        run: |
+          echo "DLC_DATABASE_HOST=postgres" >> $GITHUB_ENV
+          echo "DLC_DATABASE_PORT=5432" >> $GITHUB_ENV
+          # ... other database config
+      
+      - name: Generate Swagger Docs
+        run: go generate ./pkg/server
+      
+      - name: Build all packages
+        run: go build ./...
+      
+      - name: Wait for PostgreSQL to be ready
+        run: pg_isready -h postgres -p 5432
+      
+      - name: Run tests with coverage
+        run: go test ./... -coverprofile=coverage.out
+      
+      - name: Build binaries
+        run: ./scripts/build.sh
+```
+
+**Performance Improvements:**
+- ✅ **Faster execution**: Direct container execution without compose overhead
+- ✅ **Reliable caching**: Accurate dependency tracking with multi-file hash
+- ✅ **Simpler debugging**: Clear container boundaries and service networking
+- ✅ **Better portability**: Standard GitHub Actions patterns work across platforms
+
+**Verification:**
+- ✅ **Workflow 465**: Both jobs completed successfully (2026-04-08)
+- ✅ **All tests passing**: Database connectivity working correctly
+- ✅ **Coverage reporting**: Badges updating automatically
+- ✅ **Binary builds**: Scripts executing properly in container environment
+
+**Status:** ✅ Accepted   
+**Implementation Date:** 2026-04-08   
 **Implementation Owner:** Arcodange Team   
-**Approvers Needed:** @gabrielradureau
+**Reviewers:** @gabrielradureau